Basalt Pebble
Extrusive Mafic Igneous Rock
igneous
Category
Igneous Or Sedimentary (Water Worn)
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite Water-Worn Pebble
Intermediate to Felsic Phaneritic Igneous Rock
igneous
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Porphyritic basalt or andesite
Porphyritic volcanic rock; typically plagioclase phenocrysts in a fine mafic/intermediate groundmass
igneous
Vesicular Basalt (Amygdaloidal Basalt)
Extrusive Mafic Igneous Rock
igneous
Tumbled Slate or Basalt Pebble
Metamorphic fine-grained rock / Slate or Phyllite
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Basalt Pebble
Aphanitic mafic extrusive igneous rock
igneous
Yellow Chalcedony (Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Jasper (SiO2) with iron hydroxide inclusions
sedimentary
Greenstone / Graywacke
Metagraywacke (Chlorite-grade schistose rock)
metamorphic
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with impurities
sedimentary
Sandstone (Gneissic or Banded)
Clastic Sedimentary Rock (composed predominantly of SiO2)
sedimentary
Chert (Jasper)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode (Water-worn)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Chalcedony (Yellow/Brown Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Carnelian / Chalcedony
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (with probable Iron staining)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz Pebble (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Banded Agate (River-worn Pebble)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Small rounded tan pebble, likely quartz-rich river stone
Indeterminate; possibly quartz or quartzite (predominantly SiO₂)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
River Cobble (Diorite or Meta-volcanic with Quartz Veining)
Diorite (with SiO2 quartz veins)
igneous
River Stone (Basalt Porphyry)
Porphyritic Basalt
igneous
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone and River Pebbles
Sedimentary Rock (Sandstone / Quartzite / Chert)
sedimentary
Chalcedony (Carnelian/Agate)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Polished dark pebble, possibly basalt or chert
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline silica (chert)
igneous
Conglomerate
Conglomerate (Sedimentary Rock)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Jasper and Basalt Pebble
Polymineralic lithic pebble
igneous and sedimentary